JPH06102473A - Formation of spectacle frame to symmetrical shape - Google Patents

Abstract

PURPOSE:To provide the method for formation of spectacle frames to the symmetrical shape by forming the right and left spectacle frames to the same shape to balance the right and left shapes of the spectacle frames with the decreased deformation quantity of the spectacle frame shapes and without changing the inclination of the spectacle frame shapes with the peripheral lengths and datum lines of the spectacle frames. CONSTITUTION:The respective centroid positions of the right and left spectacle frame shapes are calculated (T2). One of the right and left spectacle frame shapes is rotated and the right and left spectacle frame shapes are nearly superposed on each other by aligning the respective calculated centroid positions (T2). The mixed shape is formed on the base of the right and left spectacle frame shapes nearly superposed on each other (T6). The fresh right and left spectacle frame shapes are calculated in accordance with the mixed shape formed in such a manner (T7). The respective peripheral lengths of the right and left spectacle frame shapes before the formation of the mixed shape are previously calculated (T1) and the calculated fresh right and left spectacle frame shapes are respectively deformed to the respective resembling shapes in such a manner that the respective peripheral lengths of the calculated fresh right and left spectacle frame shapes coincide respectively with the calculated corresponding peripheral lengths of the spectacle frame shapes.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spectacle frame shape conforming method for conforming substantially symmetrical left and right spectacle frame shapes.

[0002]

2. Description of the Related Art A processing side of an eyeglass lens calculates a desired lens shape including a bevel shape based on information about an eyeglass lens or an eyeglass frame sent from an ordering side of the eyeglass lens, and based on the result, bevel processing is performed. Information on whether or not lens processing is possible, and the expected finish shape of the spectacle lens, including the beveled shape, is returned to the ordering side, and the ordering side sends the possibility information or finish. The predicted shape is displayed on the screen to check whether lens processing including beveling is possible, or the predicted finished shape is confirmed, and based on this confirmation, the optimal spectacle lens with the bevel is determined. The applicant of the present invention has proposed a system for supplying a spectacle lens to be ordered (Japanese Patent Application No. 4-165912).

In order to improve the completeness of this system, it is necessary to balance the left and right eyeglass frames. In general, it is aesthetically preferable that the left and right eyeglass frame shapes are the same, but they are subject to shape deformation due to handling such as transportation and storage after frame production, and temporal changes in frame materials,
It may make a difference. If this difference is left as it is and the frame is framed, for example, in the case of a lens having a small lens such as a bifocal lens, the layout positions of the small lens may be different between the left and right lens frames. The difference between the left and right eyelet positions of the spectacles appears in unbalanced spectacles when viewed by a third party other than the wearer. Therefore, in order to balance the left and right eyeglass frames, the left and right eyeglass frame shapes have conventionally been made uniform. That is, for example, as disclosed in Japanese Examined Patent Publication No. 3-25298, either one of the left and right eyeglass frame shapes is directly used as both eyeglass frame shapes to process eyeglass lenses, and the other eyeglass frame shape is deformed. After that, the spectacle lens was framed.

[0004]

However, in the above-mentioned conventional method, one eyeglass frame is fixed and used as a reference, so that when there is a large difference between the actual left and right eyeglass frame shapes. However, the shape of the other spectacle frame must be significantly deformed, and the amount of deformation is limited, which is not a preferable method.

Further, in the above-mentioned conventional method, when the left and right actual eyeglass frame shapes have different perimeters, the eyeglass lens processed in conformity with the other shaped eyeglass frame is replaced with the actual other eyeglass frame. When trying to put it in the spectacle frame, there was a problem that it was not possible to fit them exactly.

Even if the left and right eyeglass frame shapes are the same, the left and right eyeglass frame shapes may have different inclinations with respect to the datum line of the eyeglasses. Since the inclination of the frame shape is changed, there is a problem that the spectacle lens is misaligned during the frame insertion.

The present invention has been made in view of such a point, and the amount of deformation of the shape of the eyeglass frame is small, and the left and right sides of the eyeglass frame can be changed without changing the circumference of the eyeglass frame and the inclination of the eyeglass frame shape with respect to the datum line. It is an object of the present invention to provide an eyeglass frame shape assimilation method in which the eyeglass frame shape is made uniform and the left and right eyeglass frames are balanced.

[0008]

In order to solve the above-mentioned problems, the present invention calculates the respective barycentric positions of the left and right eyeglass frame shapes, rotates one of the left and right eyeglass frame shapes, and calculates the respective barycenters. Match the positions and almost overlap the left and right eyeglass frame shapes, create a mixed shape based on the almost overlapped left and right eyeglass frame shapes, and calculate new left and right eyeglass frame shapes based on the created mixed shape An eyeglass frame shape conforming method is provided.

Further, the perimeters of the left and right eyeglass frame shapes before the creation of the mixed shape are calculated in advance, and the respective calculated perimeters of the new left and right eyeglass frame shapes are calculated to correspond to the calculated corresponding eyeglass frame shapes. The calculated new left and right eyeglass frame shapes are respectively transformed into similar shapes so as to match the circumferences.

[0010]

With the above structure, first, the respective barycentric positions of the left and right eyeglass frame shapes are calculated. Next, while rotating one of the left and right eyeglass frame shapes, the calculated centroid positions are matched, the left and right eyeglass frame shapes are almost overlapped, and the mixed shape is based on the substantially overlapped left and right eyeglass frame shapes. To create.

Then, new left and right eyeglass frame shapes are calculated based on the created mixed shape. This makes it possible to reduce the amount of deformation of the spectacle frame shape. In addition, the perimeters of the left and right eyeglass frame shapes before creating the mixed shape are calculated in advance, and the perimeters of the new left and right eyeglass frame shapes that are calculated are the perimeters of the corresponding corresponding eyeglass frame shapes. The calculated new left and right eyeglass frame shapes are transformed into similar shapes so that they match each other.

Thus, the left and right eyeglass frame shapes can be made uniform and the left and right eyeglass frame can be balanced without changing the peripheral length of the eyeglass frame.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 is an overall configuration diagram of a spectacle lens supply system in which the spectacle frame shape conforming method of the present invention is implemented.
A public communication line 300 connects the spectacle store 100 on the ordering side and the lens maker's factory 200 on the lens processing side. Although only one spectacle store is shown in the figure, a plurality of spectacle stores are actually connected to the factory 200.

In the spectacle store 100, an online terminal computer 101 and a frame shape measuring instrument 102 are installed. The terminal computer 101 includes a keyboard input device and a CRT screen display device, and is connected to the public communication line 300. The spectacle frame actual measurement value is input from the frame shape measuring device 102 to the terminal computer 101, calculation processing is performed in the terminal computer 101, and spectacle lens information, prescription values, and the like are input from the keyboard input device. And terminal computer 1
The output data of 01 is transferred online to the mainframe 201 of the factory 200 via the public communication line 300.

The main frame 201 is provided with a spectacle lens processing design program, a bevel processing design program, etc., calculates a lens shape including a bevel shape based on the input data, and outputs the calculation result via the public communication line 300. And returns the result to the terminal computer 101 and displays it on the screen display device, and the calculation result is displayed on each terminal computer 210, 220, 230, 240, 250 of the factory 200.
To be sent via the LAN 202.

A rough rubbing machine (curve generator) 211 and a sand polishing machine 212 are connected to the terminal computer 210, and the terminal computer 210 follows the calculation result sent from the main frame 201.
By controlling the sand polishing machine 212 and the sanding polishing machine 212, the curved surface of the back surface of the lens whose surface has been previously processed is finished.

A lens meter 221 and a wall thickness meter 222 are connected to the terminal computer 220. The terminal computer 220 sends the measured values obtained by the lens meter 221 and the wall thickness meter 222 and the main frame 201. By comparing the calculated results with the acceptance result of the lens whose curved surface on the back surface of the lens is completed, a mark (three-point mark) indicating the optical center is given to the acceptable lens.

The terminal computer 230 has a marker 23.
1 and the image processor 232 are connected, and the terminal computer 230 determines a blocking position at which the lens should be blocked (held) when edging and beveling the lens according to the calculation result sent from the main frame 201. And also used to provide blocking position marks. The jig for blocking is fixed to the lens according to the blocking position mark.

An NC-controlled lens grinding device 241 consisting of a machining center and a chuck interlock 242 are connected to the terminal computer 240, and the terminal computer 240 carries out edging of the lens according to the calculation result sent from the main frame 201. And beveling.

To the terminal computer 250, a bevel apex shape measuring device 251 is connected, and the terminal computer 25
0 compares the peripheral length and the shape of the bevel-processed lens measured by the shape measuring device 251 with the calculation result sent from the main frame 201 to determine whether or not the processing is successful.

The flow of processing until the spectacle lens is supplied in the system configured as described above will be described below with reference to FIGS. 3 and 4. There are two types of this processing flow, “inquiry” and “order”, and the “inquiry” informs the expected lens shape at the time of completion of lens processing including bevel processing so that an eyeglass store 100 is what the factory 200 asks, and “order” is that the eyeglass store 100 asks the factory 200 to send the lens before edging or the lens that has been beveled.

FIG. 3 is a flow chart showing the flow of the first input processing in the spectacle store 100. In the figure, the number following S represents a step number. [S1] The lens order inquiry processing program of the terminal computer 101 of the spectacle store 100 is started, and the order entry screen is displayed on the screen display device. Eyeglass store 100
While viewing the order entry screen, the operator specifies the type of lens to be ordered or inquired by using the keyboard input device.

That is, it is necessary to specify the lens type, whether the lens to be ordered or inquired is a bevel-processed lens or a lens which is not subjected to the edging process and the bevel process, and the lens thickness is the minimum required. Specify the processing to specify the value, the chamfer to make the edge of the minus lens inconspicuous, and the processing to polish the part.

[S2] The color of the lens is designated. [S3] A lens prescription value, a lens processing specification value, spectacle frame information, layout information for specifying an eye point position, a bevel mode, a bevel position, and a bevel shape are input.

The bevel mode includes "1: 1", "1: 2", "convex tracing", "frame tracing", and "auto-beveling" modes depending on where the bevel is placed on the lens edge. Select and enter. Here, for example, "convex contouring" is a mode in which a bevel is formed along the lens surface (front surface).

The input of the bevel position is effective only when the bevel mode is “convex”, “frame”, and “auto-bevel”, and the position of the bottom of the bevel surface is located in the rear direction from the lens surface. This is specified by 0.5 mm.

[S4] Here, it is determined whether or not the frame shape measurement by the frame shape measuring machine 102 of FIG. 2 has already been completed for the target spectacle frame. If completed, the process proceeds to step S7, and if not completed, the process proceeds to step S5.

[S5] First, in the terminal computer 101 of the spectacle store 100, processing is passed from the lens order inquiry processing program to the frame shape measurement program. Then, the measurement number attached to the spectacle frame whose shape is to be measured is input. In addition, the material of the frame (metal, plastic, etc.) is specified, and further, whether or not the frame can be bent is specified.

[S6] The spectacle frame to be measured is fixed to the frame shape measuring device 102 and the measurement is started. An outline of the structure of the frame shape measuring instrument 102 will be described later with reference to FIG. 5, and the detailed content of step S6 will be described with reference to FIG.
Will be described later with reference to.

The measurement values measured by the frame shape measuring instrument 102 are subjected to calculation processing in the terminal computer 101, and the results are displayed on the screen display device of the terminal computer 101. If the measured values are greatly disturbed or the shapes of the left and right frame frames are greatly different, an error message to that effect is displayed on the screen display device.

In the spectacle store 100, when an error message is displayed on the screen display device, inspection is performed according to the content of the error message, and measurement is performed again. [S7] If the frame shape has already been measured and the result is stored, the measurement number attached to the spectacle frame is input in order to read the stored measurement value.

[S8] The frame shape information stored for the corresponding spectacle frame is read from the internal storage medium according to the measurement number. [S9] Designate "inquiry" or "order".

Data such as lens information, prescription values, and frame information obtained by executing the above steps are sent to the mainframe 201 of the factory 200 via a public communication line.

FIG. 4 is a flow chart showing the flow of processing in the factory 200 and the steps of confirmation and error display performed in the spectacle store 100 by transfer from the factory 200. In the figure, the number following S represents a step number.

[S11] Main frame 2 of factory 200
01 includes a spectacle lens ordering system program, a spectacle lens processing design program, and a bevel processing design program. When data such as lens information, prescription values, frame information, etc. is sent via a public communication line, the eyeglass lens processing design program is started via the eyeglass lens ordering system program, and lens processing design calculation is performed.

That is, it is confirmed whether the outer diameter of the designated lens is insufficient, and if the outer diameter of the lens is insufficient, the shortage direction and the shortage amount in the boxing system are calculated, and Processing is returned to the spectacle lens ordering system program for display on the terminal computer 101.

If the outer diameter of the lens is sufficient, the front curve of the lens is determined. Next, the thickness of the lens is determined, and when the thickness of the lens is determined, the back curve of the lens,
Calculate the prism and prism base directions, and
The overall shape of the lens before edging is determined.

Here, the thickness of the edge along the entire circumference is checked for each radius vector in each direction of the frame, and it is confirmed whether there is a portion having a thickness less than the required edge thickness. If there is a point below, calculate the shortage direction and the shortage amount in the boxing system, and
Processing is returned to the spectacle lens ordering system program for display on the terminal computer 101 of 0.

If the peripheral edge thickness is sufficient, the lens weight, the maximum and minimum edge thicknesses, their directions, etc. are calculated. Then, an instruction value for the terminal computer 210 of the factory 200, which is necessary for processing the back surface of the lens, is calculated.

The above calculation is performed by the terminal computer 210,
By the rough rubbing machine 211 and the sanding polishing machine 212,
This is necessary when the lens polishing process before the edging process is performed, and various calculated values are passed to the next step.

When the stock lens is designated and the lens polishing process before the edging process is not performed, the lens outer diameter, the lens thickness, the front curve, and the back curve are preliminarily determined according to the lens type and the prescription value. Since it has been decided, and those data are stored, read those values and check whether the outer shape and edge thickness of the lens are sufficient, as in the case of the back processed product, and pass it to the next step. .

[S12] Next, the main frame 201
Then, the bevel processing design program is started via the eyeglass lens ordering system program, and the bevel processing design calculation is performed.

First, the three-dimensional data of the eyeglass frame shape is corrected according to the material of the eyeglass frame, and the error of the eyeglass frame shape data due to the material of the eyeglass frame is corrected. Next, the positional relationship between the spectacle frame shape and the spectacle lens is three-dimensionally determined based on the eye point position.

A machining origin serving as a reference when holding the lens for carrying out the bevel machining and a machining axis which is a rotation axis are determined, and the data thus far are coordinate-converted into the machining coordinates. Then, the three-dimensional bevel tip shape is determined according to the designated bevel mode. At that time, the expected deformation amount is calculated on the assumption that the three-dimensional bevel tip shape is deformed without changing the bevel circumference. When the bevel mode is a frame or when the frame cannot be bent, it cannot be deformed. If the bevel does not stand unless it is deformed, an error code to that effect is output.

The calculated amount of deformation is compared with the amount of deformation provided for each material of the spectacle frame. If the amount of deformation exceeds the amount, an error code to that effect is output. In addition,
By deforming the three-dimensional bevel tip shape, the eyepoint position shifts, so the error is corrected.

As described above, the design calculation for the three-dimensional beveling is performed. [S13] If the designation in step S9 of FIG. 3 is "order", the process proceeds to step S15, while if "inquiry", the result of the inquiry is sent through the public communication line to the eyeglass store 1
00 to the terminal computer 101, and step S14
Go to.

[S14] Mainframe 2 of factory 200
On the basis of the result of the inquiry sent from 01, the terminal computer 101 displays the expected shape of the lens or the error status at the time of completion of the beveling on the screen display device. The operator of the spectacle store 100 changes or confirms the designated input information according to the displayed contents.

That is, if no error occurs in the processing design calculation in steps S11 and S12 of FIG. 4, the lens thickness and the lens weight are sequentially displayed on the screen of the image display device of the terminal computer 101 of FIG. Order entry incoming screen to display, layout confirmation diagram that visually shows how the lenses are arranged according to the layout information specified in the eyeglass frame, left and right lenses framed in the frame and spatially arranged 3D view from any direction, bevel confirmation drawing that shows the shape of the lens and the positional relationship between the edge and the bevel in detail, left and right bevel balance that develops the edge thickness and bevel position of both the left and right lenses along the bevel Display the figure.

If an error occurs in the machining design calculation in step S11 and step S12 of FIG. 4, a message corresponding to the content of the error is displayed on the screen display device of the terminal computer 101 of FIG. To be done.

[S15] If the designation in step S9 of FIG. 3 is "order", this step is executed and it is determined whether or not an error has occurred in the machining design calculation in steps S11 and S12 of FIG. To do. If an error has occurred, the result is sent to the spectacle store 10 via the public communication line.
0 to the terminal computer 101, and the process proceeds to step S17. On the other hand, if no error has occurred, the result is sent to the terminal computer 101 of the spectacle store 100 via the public communication line, and the process proceeds to step S16 and step S18.

[S16] A message “Order received” is displayed on the screen display device of the terminal computer 101 of the spectacle store 100. As a result, it can be confirmed that the lens before edging or after beveling that can be reliably framed in the frame can be ordered.

[S17] Since the ordered lens is a lens that cannot be processed due to an error in the lens processing design calculation or the bevel processing design calculation, a message "Order not accepted" is displayed.

[S18] If "order" is designated in step S9 and no error has occurred in the lens processing design calculation or the bevel processing design calculation, the rear surface of the lens is polished in the factory 200. Performs actual processing such as processing, lens edging, and beveling.

That is, the lens processing design calculation result in step S11 has been sent to the terminal computer 210 in FIG. 2 in advance, and the rough rubbing machine 211 and the sanding and polishing machine 212 follow the calculation result sent by the lens. Finish the curved surface of the back side. Further, dyeing and surface treatment are performed by a device (not shown), and the process up to the edging process is performed.
It should be noted that when the use of the stock lens that has been subjected to such processing is designated, these processing steps are skipped. Then, quality inspection of optical performance and appearance performance of the spectacle lens processed before the edging is performed. This inspection includes
2, the terminal computer 220, the lens meter 221,
A thickness gauge 222 is used to give a three-point mark indicating the optical center. In addition, the lens before the edging process
When the order is placed from 00, the lens is shipped to the spectacle store 100 after the quality inspection is performed.

Next, based on the result calculated in step S12, the terminal computer 230 and the marker 23 shown in FIG.
1. The block jig for holding the lens is fixed to a predetermined position of the lens by the image processor 232 or the like. The lens fixed to this block jig is attached to the lens grinding device 241 of FIG.

The main frame 201 shown in FIG.
The three-dimensional bevel tip shape is calculated by performing the same calculation as the 12th bevel machining design calculation. However, in the actual processing,
Since an error may occur between the calculated lens position and the actual lens position, this error is corrected when the coordinate conversion into the processing coordinates is completed.

Then, based on the calculated three-dimensional bevel tip shape, three-dimensional processing locus data on the processing coordinates when grinding with a grindstone having a predetermined radius is calculated. The calculated machining trajectory data is sent to the NC-controlled lens grinding device 241 via the terminal computer 240. The lens grinding device 241 performs edging and beveling of the lens according to the sent data.

Finally, the terminal computer 250 and the bevel apex shape measuring device 251 measure the peripheral length and the shape of the bevel apex of the beveling completed lens. The terminal computer 250 compares the design bevel apex circumference obtained by the calculation in step S12 with the measurement value measured by the shape measuring instrument 251, and the difference between them is, for example, 0.1.
If it is within mm, it is judged as a passing product. Also, step S1
The design A size and the design B size of the frame created by the calculation of 2 are compared with the A size and the B size measured by the shape measuring instrument 251, and the difference between them is, for example,
If it is within 0.1 mm, it is judged as a passing product.

The bevel-processed lens thus completed is shipped to the eyeglass store 100. FIG. 5 shows FIG.
It is a perspective view which shows the outline of a structure of the frame shape measuring device 102 used for the shape measurement of the spectacles frame performed in step S6. Regarding the frame shape measuring instrument,
There is a detailed disclosure in Japanese Patent Application Laid-Open No. 1-305308 filed by the present applicant, and in this embodiment, the frame shape measuring instrument is used.

The frame shape measuring instrument is equipped with a measuring unit 1 for measuring the shape of the spectacle frame Fr of the spectacle frame F held by a spectacle frame holding means (not shown) so as not to move to a predetermined position. This measuring unit 1 has a U-shaped turntable 2
The rotary table 2 is rotationally driven in the Θ direction by a motor 6 via a timing pulley (not shown) attached to the lower end surface thereof, a timing belt 4 and a timing pulley 5. This rotation angle is detected by a rotary encoder 9 connected to a timing pulley (not shown) attached to the rotary table 2 via a timing belt 7 and a timing pulley 8. Motor 6
The rotary encoder 9 and the substrate 10 of the frame shape measuring device are shown in FIG. (Not shown), and the timing pulley (not shown) and the turntable 2 are rotatably supported with respect to the substrate 10 by bearings (not shown).

The rotary table 2 of the measuring unit 1 includes two side plates 11 and 1
2 and a rectangular center plate 13 connecting the both side plates. Two slide guide shafts 14 and 15 are fixed in parallel between the side plate 11 and the side plate 12. A horizontal slide plate 16 is slidably guided in the E direction along the slide guide shafts 14 and 15. For this guide, the slide plate 16 is provided on its lower surface with three rotatable slide guide rollers 17, 1.
8 and 19 are provided. In this case, one slide guide shaft 14 has two slide guide rollers 17, 1
8 comes into contact with the other slide guide shaft 15, and one slide guide roller 19 comes into contact with the other slide guide shaft 15, and these slide guide rollers 17, 18 and 19 sandwich the slide guide shafts 14 and 15 from both sides, respectively. , 15 to roll along.

The slide plate 16 has its sliding direction E.
The constant load spring 20 acts on the slide plate 16, and the slide plate 16 is pulled toward the one side plate 12. The constant force spring 20 is wound around a bushing 21, and a shaft 22 and a bracket 23
It is fixed to the side plate 12 via. Constant force spring 20
The other end of is attached to the slide plate 16. The constant load spring 20 has a function of pressing a stylus 30 described later against the inner circumferential groove of the spectacle frame Fr.

The amount R of movement of the slide plate 16 in the E direction is determined by the reflection type linear encoder 24 as a displacement measuring scale.
Measured at. This linear encoder 24 is a rotary base 2
Scale 25 extended between the side plate 11 and the side plate 12 of the
And a detector 26 fixed to the slide plate 16 and moving along the scale 25, an amplifier 27, and a flexible cable 2 connecting the amplifier 27 and the detector 26.
It consists of 8. The amplifier 27 is attached to a bracket 29 fixed to the side plate 12.

By moving the slide plate 16, the detector 2 is moved.
6 moves while maintaining a constant distance from the surface of the scale 25. In response to this movement, the detector 26 outputs a pulse signal to the amplifier 27 connected by the flexible cable 28. The amplifier 27 amplifies this signal and outputs it as a movement amount R via a counter (not shown).

A stylus 30 as a tracing stylus is held on the slide plate 16. The stylus 30 is rotatably supported by a slide bearing in a sleeve 31 fixed to the slide plate 16 so as to be vertically movable (Z-axis direction) and rotatable. The stylus 30 has an abacus ball-shaped head 32, and this head 32 comes into contact with the inner peripheral groove of the spectacle frame Fr by the action of the constant load spring 20, and the inner peripheral groove of the spectacle frame Fr is rotated by the rotation of the rotary table 2. Roll along.

At this time, the stylus 30 moves in the radial direction corresponding to the shape of the spectacle frame Fr. The moving amount R in the radial direction is measured by the linear encoder 24 via the sleeve 31 and the slide plate 16 as described above.

Further, the stylus 30 moves in the Z-axis direction corresponding to the curve of the spectacle frame Fr. The displacement measuring scale is used to detect the amount of movement in the Z-axis direction.
The axis measuring device 33. The Z-axis measuring device 33 is a light source and a built-in charge-coupled device (CCD) line image sensor fixed to the slide plate 16 and configured to move the stylus 30 in the Z-axis direction on both sides of the stylus 30. The displacement amount Z is detected by the light emitting diode (LED).

Next, the operation of the frame shape measuring instrument configured as described above will be described. The spectacle frame F is fixedly held by a spectacle frame holding means (not shown), the head 32 of the stylus 30 is brought into contact with the V-shaped inner peripheral groove of the spectacle frame Fr, and the motor 6 is rotated by a control device (not shown). As a result, the rotary table 2 connected by the timing belt 4 rotates, and the stylus 30 rolls while contacting the inner circumferential groove of the spectacle frame Fr. The rotation of the measuring unit 1 rotates the rotary encoder 9 connected by the timing belt 7,
It is detected as a rotation angle (θ). The amount of movement of the stylus 30 in the radial direction is detected by the linear encoder 24 as the amount of movement R of the slide plate 16 in the E direction, and the amount of movement in the vertical direction is detected by the Z-axis measuring device 33 in the Z direction of the stylus 30.
The amount of movement Z in the axial direction is detected. The values θ, R, and Z that form these cylindrical coordinates are not continuously measured but are measured intermittently for each predetermined increment of the rotation angle (θ), and the terminal computer 101 of FIG. Is input to. Therefore, this input coordinate value is referred to below as three-dimensional measurement shape data (Rn, θn, Zn) (n = 1, 2, 3,
..., N). N represents the number of measurements in one rotation.

In the following, in the present embodiment, the point sequence and the vector etc. represented by (n = 1, 2, 3, ..., N) by using the subscript n are spatially arranged in the numerical order of the subscript n. Means the periodic data which are lined up in a line and whose period is N with respect to this subscript n.

When the turntable 2 rotates once, the spectacle frame holding means slides a predetermined amount while holding the spectacle frame F, whereby the stylus 30 is set on the other spectacle frame, and the shape of the other spectacle frame is measured. Is done. Since the predetermined slide amount of the eyeglass frame holding means is set to a constant value in advance, it is possible to know the relative positional relationship between the two eyeglass frames from this set value and the measurement data of the left and right eyeglass frames Fr. This set value is three-dimensionally expressed and hereinafter referred to as relative position data (δX, δY, δZ). These data are also input to the terminal computer 101 of FIG. The terminal computer 101 has various constants, for example, the radius SR of the stylus 30, the inner circumferential groove angle BA, and the inner circumferential groove width B.
W and the like are input in advance.

FIG. 6 is a flow chart showing the procedure of calculation processing in the terminal computer 101 to which these data are sent, which corresponds to the processing contents in step S6 of FIG. In the figure, the number following S represents a step number.

[S601] Three-dimensional measurement shape data (R
n, θn, Zn) is strictly the head 3 of the stylus 30.
This is data representing the locus of the center axis of 2 and does not show the shape of the inner peripheral groove of the spectacle frame. Therefore, in order to obtain an accurate spectacle frame shape (shape of the inner peripheral groove), the tip portion (inner part of the stylus 30 The envelope drawn by the portion that contacts the bottom of the circumferential groove) must be obtained (in this embodiment, the calculation for obtaining this envelope is called offset calculation). This will be described with reference to FIGS. 7 and 8.

FIG. 7 shows the locus 41 of the central axis of the stylus head along the shape of the inner circumferential groove of the spectacle frame on one side in three-dimensional coordinates. FIG. 8 shows the stylus projected on the XY plane. It is a figure which shows the locus | trajectory 41 of the central axis of the head 32, and the inner peripheral groove shape 43 of the spectacle frame on one side.

First, as shown in FIG. 7, measurement shape data (Rn, θn, Zn) which are cylindrical coordinate values (n = 1, 2,
3, ..., N) are Cartesian coordinate values (Xsn, Ysn, Zn) sharing the origin 42 (n = 1, 2, 3, ..., N).
N).

Next, as shown in FIG. 8, the inner peripheral groove shape 4
Focusing on the point 3 that the locus 41 of the central axis of the stylus head 32 is deformed by the radius SR of the stylus 30 in the normal direction, the inner circumferential groove shape 43 is calculated. That is, the point on the j-th surface of the locus 41 of the center axis of the stylus head 32 (X
sj, Ysj) the normal vector in (SVxj, S
Vyj), the orthogonal coordinate values (Xj, Yj) of the corresponding inner circumferential groove shape 43 are obtained by adding the normal vector (SVxj, SVyj) to (Xsj, Ysj). By calculating this from j = 1 to j = N, the inner circumferential groove shape coordinate values (Xn, Yn) (n = 1, 2, 3, ..., N)
To calculate. The Z-axis coordinate value Zn of this inner circumferential groove shape
Is equal to Zn in the Cartesian coordinate value (Xsn, Ysn, Zn).

[S602] By the way, even if the same spectacle frame is measured, if the shape of the stylus is different, the position of the tip of the stylus head 32 may change and the stylus head 32 may be separated from the inner circumferential groove. As a result, the inner circumferential groove shape obtained in step S601 changes. Further, the radial direction of the stylus head 32 is always on a plane perpendicular to the Z-axis direction of the frame shape measuring instrument 102 in the mechanism, whereas the spectacle frame has a shape that also changes in the Z-axis direction. Therefore, the inner circumferential groove may have an inclination with respect to a plane perpendicular to the Z-axis direction of the frame shape measuring instrument 102. Also in this case, the position of the tip of the stylus head 32 changes according to the inclination. In this step, the circumferential shape of the bottom of the inner circumferential groove is obtained in consideration of the change in the stylus position as described above. Hereinafter, description will be given with reference to FIGS. 9 to 13.

9 and 10 are perspective views showing the inner circumferential groove 44 and the stylus head 32. FIG. 9 shows that the shape of the spectacle frame does not change in the Z-axis direction, but the stylus tip is located at the bottom of the inner circumferential groove. FIG. 10 shows a case where the stylus tip cannot contact the bottom of the inner circumferential groove because the eyeglass frame shape changes in the Z-axis direction. 11 is a ZX plan view of the inner circumferential groove 44 and the stylus head 32 shown in FIG. 9, and FIG. 12 is an XY plan view of the inner circumferential groove 44 and the stylus head 32 shown in FIG. FIG. 13 is a ZX plan view of the spectacle frame and the lens bevel.

When the shape of the spectacle frame does not change in the Z-axis direction as shown in FIG. 9, the contact state between the stylus head 32 and the inner circumferential groove 44 is as shown in FIGS. As shown, even with the same inner circumferential groove shape, the stylus head 32
It depends on the shape of. Therefore, the distance H between the tip 32a of the stylus head 32 and the bottom 44a of the inner circumferential groove 44 is
n is the inner circumferential groove angle BA, the groove width BW, the stylus head 32
The angle SA of the tip of the stylus and the width SW of the stylus head 32 are obtained.

As shown in FIG. 10, when the shape of the spectacle frame changes in the Z-axis direction, the contact state between the stylus head 32 and the inner circumferential groove 44 is that the inner circumferential groove 44 is perpendicular to the Z-axis direction. It changes depending on the change of the inclination TA formed with the plane. Due to this change, the inner circumferential groove shape coordinate value (X
Since an error occurs in (n, Yn), it is necessary to correct this error.

When the angle SA of the tip of the stylus head 32 is less than or equal to the inner circumferential groove angle BA, the stylus head is irrespective of the size of the angle TA formed by the inner circumferential groove 44 and the plane perpendicular to the Z-axis direction. The tip of the portion 32 always contacts the wall surface of the inner circumferential groove 44. Therefore, the tip of the stylus head 32 and the inner circumferential groove 44
It suffices to consider only the error correction in the contact state with the wall surface. First, from the inner circumferential groove angle BA and the inclination TA formed by the inner circumferential groove 44 with respect to the plane perpendicular to the Z-axis direction, the stylus head 32 is obtained.
The angle β formed by the two line segments formed by the plane formed by the tip of the crossing the inner circumferential groove 44 is determined. Then, as shown in FIG. 12A, the distance Hn between the tip portion 32a of the stylus head 32 and the bottom 44a of the inner circumferential groove 44 is obtained from the angle β and the radius SR of the stylus head 32. Such distance Hn
Is calculated over the entire circumference of the spectacle frame, and the correction amount Hn (n
= 1, 2, 3, ..., N).

As shown in FIG. 12B, the tip of the stylus head 32 has the upper edges 44b and 44c of the inner circumferential groove 44.
In the case of contacting with, the correction amount Hn (n = 1, 2, 3, ..., N) at each point in consideration of the groove width BW of the inner circumferential groove 44.
Ask for.

Further, when the angle SA of the tip of the stylus head 32 is larger than the inner circumferential groove angle BA, the inner circumferential groove 44.
The upper end 32b and the lower end 32c of the stylus head 32 may depend on the size of the angle TA formed by the plane perpendicular to the Z-axis direction.
Contacts the wall surface of the inner circumferential groove 44, and the tip of the stylus head 32 does not necessarily contact the wall surface of the inner circumferential groove 44. Therefore, the correction amount Hn (n = 1, 2, 3, ..., N) is calculated in consideration of the state where the upper end 32b and the lower end 32c of the stylus head 32 contact the wall surface of the inner circumferential groove 44.

By the way, the shape required for the beveling is the shape of the bevel tip locus in the state where it is assumed that the measured beveled lens fits into the spectacle frame. Here, this will be referred to as a bevel tip locus shape. As shown in FIG. 13, if the inner circumferential groove angle BA, the inner circumferential groove width BW, and the bevel apex angle YA are determined, the bevel tip locus shape position 55 is located at a constant distance from the bottom of the inner circumferential groove. . This distance will be called a bevel groove distance BY. The correction amount Hn (n = 1, 2, 3, ...
, N) minus the bevel groove distance BY is set as a new correction Hn (n = 1, 2, 3, ..., N).

As shown in FIG. 12C, the correction direction of the correction amount Hn is equal to the normal direction of the shape obtained by projecting the inner peripheral groove shape coordinate values (Xn, Yn, Zn) onto the XY plane. The corrected shape 45, which is deformed in the normal direction by the correction amount Hn, is again provided with eyeglass frame shape coordinate values (Xn, Yn, Zn) (n = 1,
2, 3, ..., N).

In this embodiment, the stylus head 3
2 has an abacus ball shape, but the shape of the stylus head is rotationally symmetric with respect to the Z-axis direction, and if the cross-sectional shape including the axis of rotational symmetry is known in advance, the inner circumference inclined with the stylus head. The contact state with the groove 44 can be grasped by calculation, and therefore, the correction can be performed in the same manner as described above.

[S603] Eyeglass frame shape coordinate values (Xn, Yn, Zn) corrected in step S602 (n = 1,
2, 3, ..., N), the peripheral length FLN of the spectacle frame shape (the peripheral shape of the bottom of the inner peripheral groove) is calculated. Perimeter FL of eyeglass frame shape
N is calculated by the following equation (1) as the sum of the distances between the points of the eyeglass frame shape.

FLN = Σ [((X _i −X _{i + 1} ) ² + (Y _i −Y _{i + 1} ) ² + (Z _i −Z _{i + 1} ) ² ) ^1/2 ] (i = 1 to N) (1) However, in the above formula (1), when i = N, i + 1
Is set to 1.

[S604] Generally, when the eyeglass frame is held by the frame shape measuring instrument 102 and the shape of the eyeglass frame is measured, the front direction of the left and right eyeglass frames is in the Z-axis direction of the frame shape measuring instrument 102. They are inclined to each other.
In order to grasp each inclination, vectors in the front direction of the left and right eyeglass frames are determined.

In the present invention, the front direction of the spectacle frame is defined as the direction in which the area surrounded by the two-dimensional shape projected on the plane perpendicular to the front direction is the maximum area. Figure out. There are various specific methods for defining the front direction of the spectacle frame.

FIG. 14 shows an example of a strict definition method among them, and a point G (for example, each component of X, Y and Z of the eyeglass frame shape coordinate value) located at approximately the center of the eyeglass frame shape coordinate value. The center of gravity given as the weighted average value of) is used as a starting point, and each coordinate value (Xn, Yn, Zn) of the spectacle frame shape (n =
Vector V whose end points are 1, 2, 3, ..., N)
It is a perspective view which shows _n (n = 1, 2, 3, ..., N). The unit vector FV in the front direction of the spectacle frame can be obtained by the following equation (2) using the vector V _n (n = 1, 2, 3, ..., N).

FV = Σ (V _i × V _{i + 1} ) / | │Σ (V _i × V _{i + 1} ) || (i = 1 to N) (2) where “×” is a vector , And i + 1 is set to 1 when i = N.

Further, the front direction of the spectacle frame can be approximately obtained. In this embodiment, this approximate method is used, and this method will be described with reference to FIG. FIG. 15 is a perspective view showing the front direction of one of the eyeglass frames. First, the spectacle frame shape coordinate values (Xn,
Yn, Zn) (n = 1, 2, 3, ..., N)
The point on the spectacle frame shape where Xn is the maximum value is A, the point on the spectacle frame shape where Xn is the minimum value is B, the point on the spectacle frame shape where Yn is the maximum value is C, and the minimum value is Yn. Let D be a point on the eyeglass frame shape. Next, the vector from point A to point B is H, and the vector from point C to point D is V. At that time, the unit vector FV in the front direction of the spectacle frame is defined as a vector perpendicular to the two vectors H and V, and the vector FV is calculated.

[S605] Steps S601 to S604
Processing is performed on the left and right eyeglass frame shape measurement data, and if the answer is affirmative (YES), the process proceeds to step S606, and if negative (NO), the process proceeds to step S606.
Return to 601.

[S606] Left and right eyeglass frame shape coordinate values (Xn, Yn, Zn) (n = 1, 2,
3, ..., N) have different coordinate origins, so the above-mentioned relative position data (δX, δY, δZ) are used to convert them to coordinate values of the same coordinates with the same point as the origin. This will be described with reference to FIG.

FIG. 16 is a perspective view of the left and right eyeglass frames arranged on the same three-dimensional rectangular coordinate system. First, right eyeglass frame shape coordinate values (Xn, Yn, Zn) (n = 1, 2, 3,
, N) in the X-axis, Y-axis, and Z-axis directions, respectively, by −δ
The coordinate values translated by X / 2, −δY / 2, −δZ / 2 are calculated and the right eyeglass frame shape coordinate values (Xrn, Yr
n, Zrn) (n = 1, 2, 3, ..., N), and the front direction unit vector at this time is newly set to FV.
Let r.

Next, the left eyeglass frame shape coordinate value (Xn, Y
n, Zn) (n = 1, 2, 3, ..., N) on the X axis, Y
Axis, Z axis direction, δX / 2, δY / 2, δZ /
The coordinate values translated by 2 are calculated, and the coordinate values of the left eyeglass frame shape (Xln, Yln, Zln) (n = 1, 2,
3, ..., N), and the front direction unit vector at this time is again set to FVl.

[S607] The front direction of the eyeglasses is calculated from the front direction unit vectors FVr, FVl of the left and right eyeglass frames obtained in step S606, and the left and right eyeglass frame shape coordinates are set so that the front direction coincides with the Z-axis direction. Value (Xrn, Yr
n, Zrn), (Xln, Yln, Zln) and the front direction unit vectors FVr, FVl of the left and right eyeglass frames are rotationally moved. This will be described with reference to FIG.

FIG. 17 is a perspective view showing the front direction unit vectors FVr and FVl of the left and right eyeglass frames and the front direction unit vector FVM of the eyeglasses. In this embodiment, when wearing spectacles, the left and right spectacle frames have the same inclination with respect to the plane of the spectacles (the plane perpendicular to the front direction of the spectacles), and the front direction of the spectacles is defined as the front direction of the left and right spectacle frames. Unit vector FV
It is defined in the direction of the vector of the sum of r and FVl. That is, the unit vector of the sum vector is set as the front direction unit vector FVM of the glasses.

Next, the right eyeglass frame shape coordinate values (Xrn, Yrn,
Zrn) (n = 1, 2, 3, ..., N) and left eyeglass frame shape coordinate values (Xln, Yln, Zln) (n = 1,
2, 3, ..., N) and the front direction unit vectors FVr, FVl of the left and right eyeglass frames are rotated around the origin to calculate new conversion values. [S608] Left and right eyeglass frame shape coordinate values (Xrn, Yrn, Zrn), (Xln,
Yln, Zln), the angle θd formed by the datum line of the eyeglasses in the XY plane and the X-axis direction is obtained, and the left and right eyeglass frame shape coordinate values (Xrn, Yrn, Yrn, Yrn, Zrn), (Xln, Yl
n, Zln) and the front direction unit vectors FVr, FVl of the left and right eyeglass frames are converted. That is, first, a two-dimensional shape obtained by projecting left and right eyeglass frames on a plane perpendicular to the calculated front direction of the eyeglasses is used, and a unit vector in the same direction as the tangent line contacting above the left and right eyeglass frames and the left and right eyeglass frames. The direction of the sum of the tangent line tangent to the lower side of and the unit vector in the same direction is calculated as the datum line direction of the spectacles. This is shown in FIG.
Will be described with reference to.

FIG. 18 is a plan view showing the left and right eyeglass frames projected on the XY plane (the plane perpendicular to the front direction of the eyeglasses). First, an angle θa formed by the upper eyeglasses tangent L1 that is in contact with the left and right eyeglass frame shapes above the eyeglasses and the X-axis direction is an angle θa that is lower than the eyeglasses that is in contact with the left and right eyeglass frame shapes at the same time in the X-axis direction. The angle θb is obtained. Next, since the angle θd formed by the eyeglass datum line 46 with the X-axis direction is an intermediate angle between these angles θa and θb, an average value thereof is obtained, and this average value is set as the angle θd.

Next, the right eyeglass frame shape coordinate values (Xrn, Yrn, Zrn) (n = n) converted in step S607 so that the datum lines of the eyeglasses coincide with each other in the X-axis direction.
1, 2, 3, ..., N) and the left eyeglass frame shape coordinate values (Xln, Yln, Zln) (n = 1, 2, 3, ...
, N) and the front direction unit vectors FVr, FVl of the left and right eyeglass frames are rotationally moved by the angle θd with the Z axis as the rotation axis, and new conversion values are calculated again.

[S609] Left and right eyeglass frame shape coordinate values (Xrn, Yrn, Zr) converted again in step S608.
n), (Xln, Yln, Zln), the inter-spectacle frame distance is calculated. This will be described with reference to FIG.

FIG. 19 is a perspective view of the left and right eyeglass frames showing the distance between the eyeglass frames. That is, of the right eyeglass frame shape coordinate values (Xrn, Yrn, Zrn), the point S at which Xrn has the maximum value and the left eyeglass frame shape coordinate values (Xln, Yln,
Zln), the point T at which Xln becomes the minimum value is obtained,
The length DBL of the vector obtained by projecting the vector from the point S to the point T on the ZX plane is obtained. The length DBL is the width of the nose, and in this embodiment, the distance between the eyeglass frames is represented by the nose width DBL.

[S610] The left and right eyeglass frame shape coordinate values (Xrn, Yrn, Zr) converted again in step S608.
n), (Xln, Yln, Zln) and the front direction unit vectors FVr, FVl of the left and right eyeglass frames, the A size, B size and geometric center (frame center) coordinates of the left and right eyeglass frame shapes are calculated. Together with these left and right eyeglass frame shape coordinate values (Xrn, Yrn, Zrn), (Xl
n, Yln, Zln) with the calculated geometrical centers as the origins and the front direction unit vector FVr of the left and right eyeglass frames,
FVl is converted into coordinate values that are aligned in the Z-axis direction. This will be described with reference to FIG. In the subsequent steps S610 to S612, since it is not necessary to distinguish right and left, the spectacle frame shape coordinate value is set to (Xn, Yn, Z
n) (n = 1, 2, 3, ..., N) and the front direction unit vector of the spectacle frame will be described as FV for description, but these represent both left and right. .

FIG. 20 is an XY plan view of the spectacle frame shape after the spectacle frame has been converted so that its front direction coincides with the Z-axis direction. That is, first, the eyeglass frame shape coordinate values (Xn, Yn, Zn) (n = 1, 2, 3, ..., N) so that the front direction unit vector FV of the eyeglass frame coincides with the Z-axis direction.
Is rotated around the origin. In the coordinate values (Xn, Yn, Zn) after conversion by this movement, if the maximum and minimum values of Xn are Xmax and Xmin, and the maximum and minimum values of Yn are Ymax and Ymin, then A The size 47 is obtained as an absolute value of the difference between Xmax and Xmin, and the B size 48 is calculated as Ymax and Ymi.
It is calculated as the absolute value of the difference from n.

Further, the geometric center (frame center) coordinates (FCx, FCy) are obtained by the following equations (3) and (4). FCx = (Xmax + Xmin) / 2 (3) FCy = (Ymax + Ymin) / 2 (4) Next, the front direction unit vector FV of the spectacle frame is converted so as to match in the Z-axis direction. Eyeglass frame shape coordinate values (Xn, Yn, Zn) (n = 1, 2, 3, ..., N)
Is converted into a coordinate value with the geometric center (FCx, FCy) as the origin.

Further, the eyeglass frame shape coordinate values (Xn, Y
n, Zn) (n = 1, 2, 3, ..., N) two-dimensional data (Xn, Yn) (n = 1, 2, 3, ..., N)
Are converted into polar coordinate values (Rn, θn) (n = 1, 2, 3, ..., N) with the geometric center (FCx, FCy) as the origin.

Furthermore, in polar coordinate values (Rn, θn),
The maximum value of Rn is calculated and doubled to calculate the effective diameter ED. [S611] Eyeglass frame shape coordinate values (Xn, Yn, Zn) whose origin is the geometric center found in step S610
(N = 1, 2, 3, ..., N) is regarded as approximately on a closed curve on the toric surface, and the equation of the toric surface is obtained. This will be described with reference to FIG.

FIG. 21 is a perspective view of the spectacle frame 49 for obtaining the equation of the toric surface. In the figure, the center coordinates of the toric surface are (a, b, c), and the rotational symmetry axial unit vector of the toric surface is (p, q, r). ), The maximum radius of a circle formed by cutting the toric surface in a plane perpendicular to the rotational symmetry axial unit vector (p, q, r) is the base radius RB, and the center coordinate (a of the toric surface is , B, c) and a radius of a circle formed by cutting the toric surface on a plane parallel to the rotational symmetry axial direction unit vector (p, q, r) is a cross radius RC.

In order to define the toric surface on the three-dimensional coordinates, the center coordinates (a, b, c), the base radius RB, the cross radius RC, the rotational symmetry axial unit vector (p, q,
r) as a variable, the equation of the toric surface is used as the eyeglass frame shape coordinate values (Xn, Yn, Zn) (n = 1, 2, 3, ...
, N) data is solved by the least-squares approximation method, whereby the center coordinates (a, b, c), the base radius RB, the cross radius RC, the rotational symmetry axial unit vector (p, q, r). ).

[S612] First, the tilt TILT of the spectacle frame is calculated using the front direction unit vector FV of the spectacle frame that has been converted again in step S608. This will be described with reference to FIG.

FIG. 22 is an explanatory diagram for explaining the calculation of the tilt TILT of the spectacle frame and the frame PD.
22A is a perspective view of the tilt TILT of the spectacle frame, FIG.
FIG. 3 is a plan view of a spectacle frame. That is, FIG.
As shown in (A), the tilt TILT of the spectacle frame is calculated as the angle formed by the front direction unit vector FV of the spectacle frame and the YZ plane.

Next, this inclination TILT and step S
The frame PD, which is the distance between the geometric centers, is calculated based on the nose width DBL obtained in step 609 and the A size obtained in step S610. That is, as shown in FIG. 22B, since the A size is different between the left and right eyeglass frames, if the A size of the right eyeglass frame is Ar and the A size of the left eyeglass frame is Al, the frame PD (FPD) Is calculated by the following equation (5).

FPD = (Ar + Al) / 2 · cos (TILT) + DBL (5) [S613] It is desirable that the left and right eyeglass frame shapes are the same, but there are some differences in general. Therefore, in order to balance the left and right eyeglass frames, merge processing for matching the left and right eyeglass frame shapes is performed. Details of this merging process will be described with reference to FIG.

FIG. 1 is a flow chart showing the procedure of the merge processing of the left and right eyeglass frame shapes, and step S613 in FIG.
It corresponds to the internal processing contents. In the figure, the number following T represents a step number.

Incidentally, in explaining this flowchart,
Refer to FIG. 23 and FIG. 24 as appropriate. FIG. 23 is a perspective view for explaining detection of a difference amount between left and right eyeglass frame shapes, and FIG. 24 is a perspective view showing a new eyeglass frame shape. Figure 24
FIG. 24B is an enlarged view of the portion 52 of FIG.

[T1] First, based on the orthogonal coordinate values (Xn, Yn, Zn) of the left and right eyeglass frame shapes whose origin is the geometric center obtained in step S610, the respective perimeters of the left and right eyeglass frame shapes are calculated. calculate.

[T2] Next, in one step S
A weighted average value is calculated based on the orthogonal coordinate values (Xn, Yn, Zn) of the left and right eyeglass frame shapes whose origin is each geometric center obtained in 610, and the center of gravity positions of the left and right eyeglass frame shapes are calculated. .

[T3] Then, the sign of the X coordinate value of the left eyeglass frame shape is reversed, and as shown in FIG. 23, the respective barycentric positions of the left and right eyeglass frame shapes are located at the same point G. In this way, the left eyeglass frame shape 51 is superimposed on the right eyeglass frame shape 50. Here, each radial direction θi centered on the point G
The sum of the distance Lθi between the left and right eyeglass frames is calculated, and this is set as the difference amount DE of the left and right eyeglass frame shapes.

Here, a predetermined limit deformation amount is determined in advance for the difference amount DE. [T4] Next, as shown in FIG. 24 (A), the right eyeglass frame shape 50 is fixed, and the left eyeglass frame shape 51 is rotated about the point G so that the difference DE is minimized. To do. Then, the left eyeglass frame shape (hereinafter, referred to as a second left eyeglass frame shape) 53 when the difference amount DE becomes the minimum is
The rotation angle θs and the rotation axis vector AV rotated from the above-mentioned eyeglass frame shape 51 are obtained.

[T5] Then, the rotation angle θs and the minimum difference amount are compared with a predetermined rotation angle and difference amount, and the former is larger than the latter (exceeds a predetermined reference value),
If the difference between the left and right eyeglass frame shapes is large, the process proceeds to step T9, while if the former is smaller than the latter and the difference is smaller, the process proceeds to step T6.

[T6] Next, as shown in FIG. 24B, the second left eyeglass frame shape 53 and the right eyeglass frame shape 5
A mixed eyeglass frame shape 54 that is in the middle of 0 is calculated. That is, the midpoint M of the left and right eyeglass frame positions in each radial direction θi is obtained. In addition, the determination of the mixed eyeglass frame shape 54 is performed by determining the distance between the corresponding portions of the second left eyeglass frame shape 53 and the right eyeglass frame shape 50 in addition to adopting the midpoint. It may be calculated as a set shape of points divided by the ratio of.

[T7] Then, the mixed eyeglass frame shape 54
Based on, the new left and right eyeglass frame shapes are determined. That is, the coordinate values of the mixed spectacle frame shape 54 are obtained, and the coordinate values are set as new right spectacle frame shape coordinate values, and the mixed spectacle frame shape 54
Is rotated by the rotation angle θs about the rotation axis vector AV passing through the point G in the opposite direction to the above and divided by the circumference ratio to obtain a new left eyeglass frame shape coordinate value. And

[T8] Step T is performed so that the perimeters of the new left and right eyeglass frame shapes determined in step T7 match the perimeters of the left and right eyeglass frame shapes calculated in step T1.
The new left and right eyeglass frame shapes determined in 7 are transformed into similar shapes.

[T9] The difference amount DE and the rotation angle θs obtained here are values that represent the imbalance of the left and right eyeglass frame shapes. Therefore, when these values exceed the predetermined limit values, the merge is performed. No processing is performed, and an error code indicating that the balance between the left and right eyeglass frame shapes is abnormal is output. When this error code is output,
By visually observing, a preferred one of the left and right eyeglass frame shapes is selected, and the other shape is matched with the selected shape.

Since the shape of the left and right eyeglass frames has been changed by the above merge processing, step S61 is performed.
0 to S612 are executed again. In the above embodiment, the merging process in the three-dimensional shape is shown, but the same method is used for the X process.
Two-dimensional merge processing may be performed using only the Y component. However, in that case, the spectacle frame shape is assumed to be the shape on the toric surface obtained in step S611.

[0127]

As described above, according to the present invention, one of the left and right eyeglass frame shapes is rotated, and the respective centers of gravity are made to coincide with each other so that the left and right eyeglass frame shapes are substantially overlapped with each other. A mixed shape is created based on the spectacle frame shape, and new left and right spectacle frame shapes are calculated based on the created mixed shape. Therefore, it is possible to reduce the amount of deformation of the shape of the eyeglass frame when balancing the left and right eyeglass frames.

Further, the perimeters of the left and right eyeglass frame shapes before the creation of the mixed shape are calculated in advance, and the calculated perimeters of the new left and right eyeglass frame shapes are calculated to correspond to the calculated corresponding eyeglass frame shapes. The calculated new left and right eyeglass frame shapes are respectively transformed into similar shapes so as to match the circumferences. Accordingly, the left and right eyeglass frame shapes can be made uniform and the left and right eyeglass frames can be balanced without changing the peripheral length of the eyeglass frame.

Further, new left and right eyeglass frame shapes are calculated by rotating the created mixed shape in the direction opposite to the rotation when superposing the left and right eyeglass frame shapes.
Thus, the left and right eyeglass frame shapes can be made uniform and the left and right eyeglass frame shapes can be balanced without changing the inclination of the eyeglass frame shape with respect to the datum line.

[Brief description of drawings]

FIG. 1 is a flowchart showing a procedure of merge calculation of left and right eyeglass frame shapes, which corresponds to the processing content in step S613 of FIG.

FIG. 2 is an overall configuration diagram of an eyeglass lens supply system in which the eyeglass frame shape conforming method of the present invention is implemented.

FIG. 3 is a flowchart showing a flow of first input processing in an eyeglass store.

FIG. 4 is a flow chart showing a flow of processing in a factory and steps of confirmation and error display performed at an eyeglass store by transfer from the factory.

FIG. 5 is a perspective view schematically showing the structure of a frame shape measuring instrument.

FIG. 6 is a flowchart showing a procedure of calculation processing in a terminal computer of an eyeglass store, and step S6 of FIG.
It corresponds to the internal processing contents.

FIG. 7 is a perspective view of the locus of the central axis of the stylus head along the shape of the inner peripheral groove of the spectacle frame on one side.

FIG. 8 is a plan view showing the locus of the central axis of the stylus head projected on the XY plane and the shape of the inner circumferential groove of the spectacle frame on one side.

FIG. 9 is a perspective view showing an inner circumferential groove and a stylus head.

FIG. 10 is a perspective view showing an inner circumferential groove and a stylus head.

11 is a ZX plan view of the inner circumferential groove and stylus head shown in FIG. 9. FIG.

12 is an XY plan view of the inner circumferential groove and the stylus head shown in FIG.

FIG. 13 is a ZX plan view of a spectacle frame and a lens bevel.

FIG. 14 is a perspective view showing a vector in which a point located substantially at the center of the eyeglass frame shape coordinate values is used as a starting point and each coordinate value of the eyeglass frame shape is used as an end point.

FIG. 15 is a perspective view showing a front direction of a spectacle frame.

FIG. 16 is a perspective view of left and right eyeglass frames arranged on the same three-dimensional rectangular coordinate.

FIG. 17 is a perspective view showing a front direction unit vector of left and right eyeglass frames and a front direction unit vector of eyeglasses.

FIG. 18 is a plan view showing left and right eyeglass frames projected on an XY plane.

FIG. 19 is a perspective view of left and right eyeglass frames showing a distance between eyeglass frames.

FIG. 20 is an XY plan view of a spectacle frame shape after the front direction of the spectacle frame has been converted so as to match the Z-axis direction.

FIG. 21 is a perspective view of a spectacle frame for obtaining an equation of a toric surface.

FIG. 22 is an explanatory diagram illustrating the inclination of the spectacle frame and the calculation of the frame PD.

FIG. 23 is a perspective view illustrating detection of a difference amount between left and right eyeglass frame shapes.

FIG. 24 is a perspective view showing a new eyeglass frame shape.

[Explanation of symbols]

 100 Eyeglass Store 101 Terminal Computer 102 Frame Shape Measuring Instrument 200 Factory 201 Mainframe 202 LAN 210 Terminal Computer 211 Rough Rubber (Curve Generator) 212 Sanding Polisher 220 Terminal Computer 221 Lens Meter 222 Thickness Meter 230 Terminal Computer 231 Marker 232 Image processor 240 Terminal computer 241 Lens grinding device 242 Chuck interlock 250 Terminal computer 251 Shape measuring instrument 300 Public communication line

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[Procedure amendment]

[Submission date] November 5, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction content]

In the spectacle store 100, an online terminal computer 101 and a frame shape measuring instrument 102 are installed. The terminal computer 101 includes a keyboard input device and a CRT screen display device, and is connected to the public communication line 300. The spectacle frame actual measurement value is input from the frame shape measuring device 102 to the terminal computer 101, calculation processing is performed in the terminal computer 101, and spectacle lens information, prescription values, and the like are input from the keyboard input device. And terminal computer 1
The output data of 01 is transferred online to the mainframe 201 of the factory 200 via the public communication line 300. The terminal computer 101 and the mainframe 2
A relay station may be provided between 01 and 01. Well
Also, regarding the installation location of the terminal computer 101, glasses are used.
It is not limited to the store 100.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] 0032

[Correction method] Change

[Correction content]

[S8] The frame shape information stored for the corresponding spectacle frame is read from the internal storage medium according to the measurement number. According to the above steps S1 to S8
, Spectacle lens information, spectacle frame information, prescription value, layout
A processing rule that is at least one of information and processing instruction information
Item data is sent. [S9] Designate "inquiry" or "order".

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0035

[Correction method] Change

[Correction content]

[S11] Main frame 2 of factory 200
01 includes a spectacle lens ordering system program, a spectacle lens processing design program, and a bevel processing design program. When data such as lens information, prescription value, frame information , layout information, and bevel information is sent via the public communication line, the eyeglass lens processing design program is started via the eyeglass lens ordering system program, and the lens processing design calculation is performed. Done. That is, bevel
A desired lens including the shape is calculated.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0044

[Correction method] Change

[Correction content]

Hold the lens for beveling
In this case, the machining origin that becomes the reference and the machining axis that is the rotation axis are determined.
Therefore, the coordinates of the data so far are converted into the processing coordinates. So
And three-dimensional bevel tip shape(Including bevel locus)
Is determined according to the designated bevel mode. That
When changing the 3D bevel tip shape, do not change the bevel circumference.
The amount of deformation expected is
calculate. When the bevel mode is frame
When bending is not possible, it cannot be deformed.
If the bee does not stand, an error code to that effect
Is output.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Name of item to be corrected] 0045

[Correction method] Change

[Correction content]

The calculated amount of deformation is compared with the amount of deformation provided for each material of the spectacle frame. If the amount of deformation exceeds the amount, an error code to that effect is output. In addition,
By deforming the three-dimensional bevel tip shape, the eyepoint position shifts, so the error is corrected. Also, the error in restoration is corrected. These processes
It can be done selectively.

[Procedure correction 6]

[Document name to be amended] Statement

[Correction target item name] 0051

[Correction method] Change

[Correction content]

[S16] A message "Order received" is displayed on the screen display device of the terminal computer 101 of the spectacle store 100. As a result, it can be confirmed that the lens before edging or after beveling that can be reliably framed in the frame can be ordered.

[Procedure Amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0077

[Correction method] Change

[Correction content]

9 and 10 are perspective views showing the inner circumferential groove 44 and the stylus head 32. FIG. 9 shows that the shape of the spectacle frame does not change in the Z-axis direction, but the stylus tip is located at the bottom of the inner circumferential groove. FIG. 10 shows a case where the stylus tip cannot contact the bottom of the inner circumferential groove because the eyeglass frame shape changes in the Z-axis direction. Figure 11 is Ru ZX plan view der of circumferential grooves 44 and the stylus head 32 shown in FIG. Figure 12 is Ri XY plan view der of circumferential grooves 44 and the stylus head 32 shown in FIG. 10, FIG. 25 FIG. 1
It is a top view which passes through the circle 32d shown by 0. FIG. 13 is a ZX plan view of the spectacle frame and the lens bevel.

[Procedure Amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0078

[Correction method] Change

[Correction content]

When the shape of the spectacle frame does not change in the Z-axis direction as shown in FIG. 9, the contact state between the stylus head 32 and the inner circumferential groove 44 is as shown in FIGS. As shown, even with the same inner circumferential groove shape, the stylus head 32
It depends on the shape of. Therefore, the distance H between the tip 32a of the stylus head 32 and the bottom 44a of the inner circumferential groove 44 is
n is the inner circumferential groove angle BA, the groove width BW, the stylus head 32
The angle SA of the tip of the stylus and the width SW of the stylus head 32 are obtained. That is, SA ≦, as shown in FIG.
In the case of BA, the tip 32a of the stylus head 32 is always
Since it is in contact with the bottom 44a of the inner circumferential groove 44, Hn = 0
Become. In addition, as shown in FIG. 11B, SA> BA,
And when BW ≧ SW, the upper end 32 of the stylus head 32
b and the lower end 32c contact the wall surface of the inner circumferential groove 44.
Then, find the height Vb from SW and SA.
And the height Tb is calculated from BA and the distance Hn is calculated based on the following formula.
Ask for. Hn = Tb−Vb Furthermore, as shown in FIG. 11 (C), SA> BA, and
When BW <SW, the side surface of the stylus head 32 is an inner circumferential groove.
Since it is in contact with the upper edges 44b and 44c of 44, BW and S
Calculate the height Vc from A, and the height from BW and BA
Tc is calculated, and the distance Hn is calculated based on the following formula. Hn = Tc-Vc

[Procedure Amendment 9]

[Document name to be amended] Statement

[Correction target item name] 0079

[Correction method] Change

[Correction content]

As shown in FIG. 10, when the shape of the spectacle frame changes in the Z-axis direction, the contact state between the stylus head 32 and the inner circumferential groove 44 is that the inner circumferential groove 44 is perpendicular to the Z-axis direction. It changes depending on the change in the angle TA with the plane. Due to this change, the inner circumferential groove shape coordinate value (X
Since an error occurs in (n, Yn), it is necessary to correct this error.

[Procedure Amendment 10]

[Document name to be amended] Statement

[Correction target item name] 0080

[Correction method] Change

[Correction content]

That is, the tip 3 of the stylus head 32
When the angle SA of 2a is equal to or less than the inner circumferential groove angle BA, the tip of the stylus head 32 must be the inner circumferential groove regardless of the size of the angle TA formed by the inner circumferential groove 44 and the plane perpendicular to the Z-axis direction. Groove 4
Contact the wall surface of No. 4. Therefore, it is only necessary to consider the error correction in the contact state between the tip of the stylus head 32 and the wall surface of the inner circumferential groove 44. First, the inner circumferential groove angle BA and the angle T
From A and A, two line segments La and Lb formed by intersecting the inner circumferential groove 44 with a flat surface including the tip portion 32a of the stylus head 32 (a plane including the X axis and the Y axis in FIG. 10). Find the angle β formed by. And the tip portion 3 of the stylus head 32
The distance Hn between 2a and the bottom 44a of the inner circumferential groove 44 is obtained from the angle β and the radius SR of the tip 32a of the stylus head 32. That is, first, as shown in FIGS.
A circle of radius SR of the tip 32a of the stylus head 32
At the same time contact two line segments La and Lb that intersect at an angle β.
Distance SDW between contact point 44d and contact point 44e
Ask for. Further, between the upper edges 44b and 44c of the inner circumferential groove 44.
Find the distance BDW. The two line segments La and Lb are
When not touching the circle of the tip 32a of the head 32
Translates these line segments so that they touch the circle
The distance SDW is calculated from Then, as shown in FIG.
When BDW ≧ SDW, the tip of the stylus head 32
The end portion 32a has an inner circumference at the contact points 44d and 44e.
Since it is in contact with the wall surface of the groove 44, from SDW and SR
Calculate the height VSa, and the height TS from SDW and β
a is calculated, and the distance Hn is calculated based on the following formula. Hn = TSa-VSa

[Procedure Amendment 11]

[Document name to be amended] Statement

[Correction target item name] 0081

[Correction method] Change

[Correction content]

In addition, BDW <as shown in FIG.
In the case of SDW, the tip 32a of the stylus head 32 is
Since it contacts the upper edges 44b and 44c of the inner circumferential groove 44, the BDW
And the height VSb from SR, and BDW and
The height TSb is calculated from β, and the distance Hn is calculated based on the following formula.
Meru. Hn = TSb−VSb The distance Hn thus obtained is calculated over one round of the spectacle frame.
Then, the correction amount Hn (n = 1, 2, 3, ...,
N).

[Procedure Amendment 12]

[Document name to be amended] Statement

[Correction target item name] 0082

[Correction method] Change

[Correction content]

[0082] Next, the tip 32 of the stylus head 32
When the angle SA of a is larger than the inner peripheral groove angle BA, the upper end 32b and the lower end 32c of the stylus head 32 may be the inner peripheral groove depending on the size of the angle TA formed by the inner peripheral groove 44 and the plane perpendicular to the Z-axis direction. will contact the wall surface 44, the tip 32a of the stylus head 32 is not in contact with the wall surface of the inner peripheral groove 44 necessarily. Therefore, the upper end 3 of the stylus head 32
The correction amount Hn (n = 1, 2, 3, ..., Considering the state where 2b and the lower end 32c contact the wall surface of the inner circumferential groove 44).
N) is calculated. That is, first, the stylus head 32
Between the tip 32a and the upper end 32b and the lower end 32c
At what position of the inner circumferential groove 44 is in contact with the wall surface of the inner circumferential groove 44 is considered.
Here, the shape of the stylus head 32 is the upper end direction and the lower end direction.
Since the orientation is symmetrical, the stylus head 32
Consider only the period from the tip portion 32a to the upper end 32b. Figure
As shown in FIG. 10, the stylus head 32 has a tip portion 32 a.
The center of the circle is O1, and the distance from this center O1 in the Z-axis direction
Stylus head 32 centered on a point O2 separated by a distance d
32d on the side surface of is in contact with the wall surface of the inner circumferential groove 44
And A plane that passes through this circle 32d (see the XY plane in FIG. 10).
Parallel planes) are shown in FIG. FIG. 25B shows FIG.
5 (A) is a partially enlarged view of FIG. In FIG. 25, first,
Water from the bottom 44a of the inner circumferential groove 44 to the center O2 of the circle 32d
The horizontal distance ds is obtained. Here, the wall surface of the inner circumferential groove 44
The angle β ^* of the lines 44a-44b and 44a-44c is 2 ^* , etc.
The direction of the dividing line is vertical and the direction perpendicular to this bisector
Is the horizontal direction. ds is the following from the angle TA and the distance d
It is given based on the formula. ds = d / tan TA Next, the wall surface lines 44a-44b of the inner circumferential groove 44 and the circle 32d
Let 44a ^* be the intersection with the vertical line passing through the center O2 of
Vertical direction from the bottom 44a of the inner circumferential groove 44 to the point 44a ^*
The heading distance ts (d) is obtained from the distance ds and the angle β ^* ,
This distance ts (d) is a function with d as a parameter.
ing. By the way, mark point 44a ^* in FIGS.
Assuming that the bottom 44a of the inner circumferential groove 44 is
By the same method as the calculation of the distance Hn described with reference to
Calculate the distance hn (d) between the bottom of the circle 32d and the point 44a ^*
can do. The distance hn (d) calculated here is
It is a function with d as a parameter. Note that FIG.
The part indicated by the symbol ( ^* ) in addition to
11 shows the corresponding parts of FIGS. More
Here, from the center O2 of the circle 32d to the bottom 44a of the inner circumferential groove 44.
Calculate the vertical distance TO (d) at
It TO (d) = sr (d) + hn (d) + ts (d) sr (d) is a circle 32d in which d is a parameter.
Is the radius. TO (d) is a function with d as a parameter
Has become. The circle 32d is the stylus head 32.
From the tip 32a (d = 0) of the stylus head 32
When changing to the end 32b (d = SW / 2),
The value d0 of the distance d that maximizes the distance TO (d) is obtained.
Stylus head centered on a position at a distance of d0
The circle on the side surface of the portion 32 actually contacts the wall surface of the inner circumferential groove 44.
It is a circle. The distance Hn at this time is calculated based on the following formula.
To be done. Hn = TO (d0) -SR In addition, the case described with reference to FIG.
Is a rare case, so to increase the calculation speed
It may be omitted.

[Procedure Amendment 13]

[Document name to be amended] Statement

[Correction target item name] Fig. 25

[Correction method] Added

[Correction content]

25 is a view showing a plane passing through a circle 32d shown in FIG.

[Procedure Amendment 14]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 10

[Correction method] Change

[Correction content]

[Figure 10]

[Procedure Amendment 15]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 11

[Correction method] Change

[Correction content]

FIG. 11

[Procedure Amendment 16]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 12

[Correction method] Change

[Correction content]

[Fig. 12]

[Procedure Amendment 17]

[Document name to be corrected] Drawing

[Correction target item name] Fig. 25

[Correction method] Added

[Correction content]

FIG. 25

Claims (2)

[Claims] 1. An eyeglass frame shape conforming method for isolating left and right substantially symmetrical eyeglass frame shapes, wherein each barycentric position of the left and right eyeglass frame shapes is calculated, and one of the left and right eyeglass frame shapes is rotated. , The calculated respective barycentric positions are matched, and the left and right eyeglass frame shapes are almost overlapped with each other, and a mixed shape is created based on the substantially overlapped left and right eyeglass frame shapes. A method for isolating eyeglass frame shapes, which is characterized by calculating new left and right eyeglass frame shapes. 2. The perimeters of the left and right eyeglass frame shapes before the creation of the mixed shape are calculated in advance, and the calculated perimeters of the new left and right eyeglass frame shapes correspond to the calculated values. 2. The eyeglass frame shape conforming method according to claim 1, wherein the calculated new left and right eyeglass frame shapes are respectively transformed into similar shapes so as to match the perimeters of the eyeglass frame shapes.